Level structure of 30S: Implications for the astrophysical 29P( p, γ )30S reaction rate in ONe novae and x-ray bursts

摘要

A γ -ray spectroscopy study of 30S is presented. Excitation energies have been determined with improvednprecision over previous studies and firm spin-parity assignments have been made for key 29P + p resonant states.nAn evaluation of the 29P(p, γ )30S reaction for T = 0.08–2.5 GK shows that the 3+ and 2+ resonant statesnlocated at Er = 289(3) and 410(3) keV, respectively, dominate the 29P(p, γ )30S reaction rate in ONe novae,nwhile the 410-keV resonance is expected to govern the rate in x-ray burster environments. These new, precisenresonance energy measurements and firm spin-parity assignments have significantly reduced uncertainties in then29P(p, γ )30S reaction in ONe novae and x-ray bursts. In particular, the reaction rate is now specified preciselynenough for calculations of isotopic abundances in ONe novae ejecta.